Machine for drying coffee and the like.



V R. OKR'ASSA. MACHINE FOR DRYING GOFPEE AND THE APPLICATION FILED 'SEPT. 6, 1911. 1,027,146.

LIKE.

' Patented May 21, 191 2].

2 SHEEIS-SHEBT 1 @gli R. OKRASSA. MAGHINE FOR DRYING COFFEE AND THE LIKE.

APPLICATION FILED SEPT. 6, 1911.

Patented May 21, 1912.

2 SHEETS-SHEET 2! COLUMBIA PLANDGRAPH c0., WASHINGTON, n. c.

UNI D STATES PATENT OFFICE.

RoBEn-ro 'OKRASSA', or "ANTIGUA, eU'ArnMA-LA.

1 FOR"DRYI1\TG; corrnniiivnvrnn LIKE.

of. Prussia, and residing at Antigua, Guate mala, Central America, have invented a cer tain new and useful Improvement n Machines for Drying Coffee and the Like, of

a which the following is a specification.

'material slightly flattened on one diameter broken up or divided into compartments This invention relates to improvements in machines for drying coffee and the like of the general construction described for instance in the specification of British Letters Patent No. 9446 of 1900.

The principal objects of the present improvements are to increase the bearing surface of the revolving shaft and to economize lubricant; to provide a better construction of central tube without reducing the perforated area; to provide for concentration of the air outlet; and to provide inwardly opening doors on the drum. These objects are attained with a machine constructed as hereinafter described and illustrated in the accompanying drawings. 7

In the said drawings Figure l is a part side elevation part vertical section of the improved machine; Fig. e is a transverse section of the central tube and hollow shaft; Figs. 2, 3, 5 and 6 show details. Fig 7 is a transverse section through the drum and the parts inclosed thereby, and Fi 8 is an enlarged detail view to show one of the doors and coiiperating parts.

As shown, the machine includes a drum A built up of steel plates or other suitable and secured to end castings B. These end castings are secured (preferably by means of a double saddle key, as shown) to a hollow shaft G supported by fixed bearings D. The shaft being hollow, instead of solid, as

heretofore, the bearing surface is increased and lubricant economlzed. To revolve the drum, a spur gearing ringE is secured to the end plate. V

The drum is divided internally into two semi-cylindrical chambersby division plates F secured to T irons fastened on the end plate, access to the chambers being provided by inwardlyopeningrdoors G secured to the shell on each side of the division'plate F. The interior of each of the two chambers is by a series of partitions H, so that the charge to be dried will be brought 1nt1- mately incontact' Witha current of hot air Specification of Letters Patent.

blown in at thebearing which is pro vided with a flange for connection to; the source of the hot air supply, and prevented from escap ng through the hollow shaft by V V v PatentedM-ay 21,1912. Application filed September 6, 1911. [Serial No. 648,002. r

means of a plate secured to the boss ofthe bearing, the hot air entering the drier through theperforated central tube J, and, after glving up its heat to the'moving mass, passmg out through the air frames K secured to the shell of the drum.

The central tube J, instead of being perforated over the whole surface as heretofore, is made so that only a part of the sur-" face'is perforated, but, in order not to diminish the perforated area, the perforated parts K of the said central tube are corrugated, as shown in cross section in Fig. 5.

The free air frames K are each composed of a perforated plate bent to the form shown in cross section in Fig. 6 and secured'toan angle iron frame bolted to'the shell of the drier which is flattened to receive it. By this arrangement of free air frames the outletof air is concentrated, so that the air will not escape without touching the charge.

As above indicated, the doors G open inwardly so that there is no difiiculty in 010- tainlng a sample or discharging the contents of the drum. Each door G is carried by a pivoted arm G and is provided with alatch L, which, when the door is opened, engages with a spring catch N secured to the shell of the drum, thus holding the door open. When the door is to be closed the spring catch N may be released from the latch'L V by means of a pull rod m one end of which is attached to the free end of the said spring catch the other end' of which is provided with a handle or button M. When thus released the door will be closed by the spring a.

Having now described my invention what I claim and desire to secure by Letters Patent of the United States is 1. In a machine for drying cofiee and the like, in combination, a drum having an air outlet, a hollow shaft coaxial with the drum to which the drum is fixed, partitions dividing the drum into compartments, and a central tube surrounding the shaft, said tube composed partly of perforated corrugated I plates.

2. In a machine for drying coffee andthe 7 like, in combination, a drum having apertures inits walls,frames of perforated corrugated sheets fitted in said apertures, a hollow shaft coaxial with the drum to which the drum is fixed, partitions dividing the drum into compartments, and a perforated central tube surrounding the shaft.

3. In a machine for drying coiiee and the like, in combination, a drum having an air outlet, and formed with doorways, inwardly opening doors fitted to said drum and adapted to close said doorways, devices tending to hold said doors normally in position to close said doorways, a hollow shaft coaxial with the drum to which the drum is fixed, partitions dividing the drum into compartments, and a perforated central tube surrounding the shaft.

In testimony whereof I have signed my 15 name to this specification in the presence of two subscribing witnesses.

ROBERTO OKRASSA.

Witnesses V F. Bor'rn, I AUeUs'ro SoHARoTH.

Copies of this patent may he obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

